Brake-shoe.



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BR HOE. N riLEn res APPLICAT 9, i916.

Lm. Patented Das. 26,1916.

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ernten CHARLES W. ABMBBUST, OF CHICAGO, ILLINOIS, ASSIGNOB, BY MESNEASSIGNMENTS,

. T0 TEE .AI'IIIERICAN BRAKE SHOE & FOUNDBY COMPANY,

0F 'WILMINGTON, DELA- wann, a coarona'rron or DELAWARE.

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terasse.

To all whom #may concern."

Be it known that I, CHARmsW. ARM- nUs'r, a'citizen of the UnitedStates,residing at Chicago, in the countyof Cook-and' State of Illinois,- havevinvented a certainv new and useful Improvement in Brake- Shoes, ofwhich the following is a full, clear,

concise, and exact description, reference be ing had ,to theaccompanying drawings, forming a part of thisk specification.

My invention relates. to brakeshoes and has for its object the provisionof an improved .back for brake shoes which shall be' simple inconstruction and easyof` manufacture.

My invention contemplates broadly. the provision of a blank in such a.way that a key lug may be formed from this blank without distorting theremaining portions of the blank, by which I mean the remain'-A ingportions of the blank are to be left substantially in the shape of anarc, circle or curve. The finger which forms the lug may be either inone piece, or may consisto a pair of fingers which coperate to form thekey lug. f l

I will explain several forms of carrying out my invention more in detailby referring to the accompanying drawing, in whichz` Figure 1 is alongitudinal sectional view of a brake shoe having my improved back inpositiong Fig. 2 is a sectional view on line b--b of Fig. 1; Fig. 3 is atop view of the back before uniting with the shoe; Fig. 4 is a top viewof a blank showing a modified form, and Fig. 5 is a top view of a blankshowing another modified form.'

Referring more particularly to Fig. 1, my improved back l is shown asmounted vin place within a shoe 2. Y The back 1 prefA drawn out from thebody portion 3 to forml opposite sidesy of thekey lug. The fingers arebent upwardly substantially into l.-

shape and approach eachother from opposite sides, overlapping slightly'at the central top portion, as more clearly apparent from Fig. 3- A keySlot 6 is ofcourse provided as readily understood. Openings 12 are leftin the edges .of the fingers to permit the metalv of the shoe 2 to passtherethrough andmore thoroughly interlock and hold themin the properposition. It will be-seen from this that themetal for the key lug isyformed from the body of the back without 1n any way distorting thisback except to give it the necessary curvature. I-Ioles 13 are providedin the body portion 3 to more thoroughly unite the back and the shoe.

n In Fig. 4,`I show a modified form along the same general lines asshown in Figs. 1 and 3, which modified form is shown merely ,inthejshape of a blank, this blank having the body portion 3 provided withholes 14 which'perform the same function as the .holes 13 in Fig. 3.formed. from the two fingers 15, and 15, 'which fingers are bentupwardly along the lines 16, 16, suitable holes 17 being providedmorethoroughly to have the parts lmited together. The fingers 15 alsohave cut-away portions 18, which cut-away portions, when these fingersare bent into C- shape, aline to form the key slot. An extending portion19 of these. fingers remains Specication of Letters Patent. v Patented@gea 26, g, l Application med February ia,- 191e. serial no. 79,237.

rl`he key lug is then horizontal, the fingers being bent again at fromthe line 22 to the line 23, extend vertically'from the line 23 to theline 20, and then again extend horizontally. The openings 18 aline toform the key lug. A. central strip 24 of the back remains intact forvstrengthening purposes. Again it will be 'seen that the back remains inits original condition except that it is given the necessary curvature.y v 4 In Fig. 5, I show a modied 'form of the invention in which thefingers 15a and 15- are drawn from the body portion 3 at right angles tothe manner of drawing themin From what has been described it isthoughtthe nature of my invention will be readily clear to those skilled in theart.

Having however thus described several forms which my invention may take,what I claim as new and desire to secure by Letters Patent is;

' 'shim posit/ely extending 1. A back for a brake 'shoe provided with a;key 1u said key lug consisting of two untwiste fingers drawn out of thebody of the back without bending the remaining poi'- tions ofthe saidback.

2..A back for a. brake shoe provided with a key lug, said keylug-consisting of two cooperatingg .interlocking fingers formed out othe bodi of the back.

for a. brake shoe provided with said key lug consisting of two op.-untwisted fingers drawn out of the body of the back without bending theAremainin portions of the said back.

4. A back or a a key lug, operating, ing ngers back.

5. A. back for a a. key lug. said key a' key lug,

interlocking oppositely extendformed out of the body of' the lugconsisting of two iintwisted iingers drawn out of the -body of the back,each forming a portion of said lug without bending the remainingportions of the said back.

6. Aback for a brake'shoe provided with a key lug, said key lugconsisting of two oppositely extending untwisted fingers formed out ofthe portion of said lug.

7 A back for a brake shoe provided with a key lug, said key lugconsisting of two body of the back, in s brake shoe provided with saidkey lug consisting of twoco brake shoe provided with body of the back,eaeh forming a provided with the back within its edges.

10. A back for a. brake shoe provided with tending untwisted fingersdrawn out of the one operation.

A11. A back for abrake shoe provided with two key lugs formed oftwoopposi'tely .extending ingers drawn out of the back, each forming a'portion of said key lug.

12. A back for a brake shoe provided with a. ke lug consisting of twooppositely extending fingers drawn out of the body of the back, in oneoperation.

13. A back for a brake shoe havin stamped to form a holding lug bac-k.

In witness whereof, I myname this 16th day of February, A. D.

CHARLES AW. ARMBRUST.

Witnesses: A HzEi. A. JONES, MAY N. ZABEL.

fingers or said hereunto subscribe keyv lug consisting of two oppositelyex-

